Acusound pickup - advice?

I'm pretty sure I'm gonna buy an acusound pickup froma freind of mine. I don't know the serial number, but its the one with a contact element which is attached to the bridge and a microphone which is attached to the tailpiece. There are seperate volume controls for each pickup which can be mixed on the preamp, which is also attached inside the tailpiece. Does anyopne have this pick-up? If so please let me know how you are getting along with it!